<?php 
header("Content-type: text/html; charset=utf-8");

$num1 = 30;
$num2 = 40;

$a = "Sum";

$a($num1, $num2);


function Sum($num1 ,$num2)
{
	static $num=0;
	if($num==0){
		echo "第一次使用";
		$num++;
	}
	$num1++;
	$num2++;
	return $num1+$num2;
}













 ?>